A lot of the time, I suggest, the answer is "Not very". ............................................. Who else feels the same way?
Cheers,
R.

Roger: I feel as you. BUT, I also recognize that IQ or the "look" of a photo rather than the content is primary to many here. There are RFF'ers who have multiple lenses of identical focal lengths simply because they look different.

While you and I say "not very", I still have 35mm and 6x7 cameras. You have 35mm, MF, 5x4, and 8x10 (do you say 10x8 over there?)